Originally Posted by PaulRivers

With road biking I haven't fallen over with flats on my bike since I was a small child and I'm in my 30's now.
With clipless I fell once at very low speed when I was first learning but I probably could have avoided that as well had I spent more time practicing before riding. Even there I have not fallen since then. (I've since gone back to flats but the reasons are unrelated to this topic).

If you can't ride a bike without periodically falling over onto the road I would suggest that perhaps biking is not for you, as it is fairly dangerous to fall onto blacktop. My uncle broke his hip doing it (not clipless).

But it's very uncommon for adults riding flat pedals to fall over on their bike. Not sure what else I could add.